Juhani states: Oct 26, 2015 at three:28 am The issue is always that you must get many of the light to 1cm x 1cm area. I have 100W led (8k lm) but I get more light to screen from one 1k lm Cree XM-L2. Next challenge is definitely the slender wavelength pattern of any led. The colour wheel in DLP projector dimms the light far more.The Epson H799A pro